Former Joshua Tree National Park ranger Joe Zarki will discuss his new book and hold a book signing at the Old Schoolhouse Museum in Twentynine Palms Saturday, May 9 from 1 to 4 p.m. His book, “Images of America—Joshua Tree National Park” will be available for purchase at the book signing. A discount is available for members of the Twentynine Palms Historical Society. The Old Schoolhouse Museum is at 6760 National Park Drive.